Method of manufacturing abrading-disks.



J. A. HICKEY.

METHOD OF MANUFACTURING ABRADING DISKS.

APPLICAT|0N FILED AUG.3. I916.

Patented June 11, 1918..

Haa vwemtoz cosnrn A. nrcxn'r, or PHILADELPHIA, PENNSYLVANIA, nssreivon. or ONE-HALF To us BANCROFT, or MEBCHANTVILLE, NEW JERSEY.

METHOD 01 M41? UFAGTURIN G ABRADING-DISKS.

Specification of Letters Patent.

Patented am ii, rate.

To all whom it may concern:

Be it known that I, JOSEPH A. HroKnY, a citizen of the United States, residin in the city and county of Philadelphia, tate of Pennsylvania, have invented certain new and useful Improvements in Methods of Manufacturing 'Abrading-Disks, of which the following is a specification.

an improved apparatus for and method of manufacturing abrading disks in which the steps of the process, consisting of heating, compressing or compacting and annealing, are performed continuously and successively in a single ap aratus.

A further 0 ject of my invention is to so operate upon and treat the abrading disks .as to eatly improve their grinding or "cutting e ciency and also so as to enhance their durability and length of service.

A further object of my invention is to cheapen the cost of manufacture while at the same time improving the quality of the product.

Other objects and advantages of my invention will be referred to and specifically pointed out in the detailed description thereof which follows or will be apparent from such description.

In the accompanying drawing I have illus-' trated a convenient form of apparatus embodying my invention and by the aid of which the new and novel method invented by me may be practised in a commercial and practicable manner. It will be understood,

, however, that the said method may be practised by other forms and constructions of apparatus and that my invention is not limited to the constructional detail herein shown and described.

In the drawing Figure 1 is a view partly in longitudinal section and partly in side elevation of an apparatus illustrative of my invention and" by means of which the new and novel method invented by me may be practised.

Fig. 2 is a plan view taken on the line 2d2 of Fig. 1, showing the parts enlarged; an

Fig. 3 is a view showing a valve construction for controlling the direction of flow of a compressed fluid for operating certain parts.

The object of my invention is to provide- Referring to the drawings, 1 designates a floor or other suitable support upon which the principal or greater portion of the apparatus 1s supported. 2 designates a preheating chamber having a traveling conveyer 3 therein supported upon feeding drums or rollers, one of which, 4, is shown in said Fig. 1. These drums are supported upon standards, such as 5, secured to and supported upon the floor or other support 1. The latter, as will be observed, is supported upon columns 6.

The abrading disks 10 to be treated are first formed of suitable comparatively refractory material, which upon being subjected to sufiicient'heat becomes plastic, and are then placed upon the traveling conveyer 3 and are moved slowly through the said pre-heating chamber 2, wherein the moisture and other gas forming substances and gases are removed or eliminated therefrom. While in this chamber they are subjected to a temperature of from 600 to 1000 degrees Fahrenheit. The abrading disks 10 after having been raised to a temperature of from 600 to 1000 degrees Fahrenheit are fed on to a table 12 and are moved by any suitable means forwardly thereover and are placed in a furnace 15. The bottom of said furnace consists of a disk of highly refractory material 16 which is of considerable thickness as shown. Fuel is supplied to the furnace 15 through orifices 17 leading from a fuel supply pipe 18 which, in the construction shown, surrounds the outside of the furnace 15. The burning of the fuel in the furnace produces a temperature therein suificientto raise the abrading disks to a white heat temperature at which the material thereof is in a plastic state. Such temperature ordinarily' is around 2200 or 2300 degrees Fahrenheit. The upper end of the furnace 15 projects into an opening 19 in the table 12, its upper edge being in a position such that the surface of its top edge is flush with the top surface of the table. When a disk is within the furnace 15 such furnace is closed by means of a cover 20 pivotally connected at 21 with the said table 12.. Said cover is provided at its center with an opening 22 to permit hot vapor or vapors to escapefrom the furnace 15. A depression-23 is formed adjacent to the edge of the said cover to provide means whereby the cover may be turned about its pivot into the dotted line position shown in Fig. 2 to .the cy inder underneath the piston 27 to actuate the same to raise the bottom 16 to a position such that its top surface is flush with the top surface of thetable 12. When so raised or lifted it carries any abrading disk 10 which may be therein into such position that it may be moved forwardly over the table for further treatment, as will be hereinafter described, and the said bottom will also be in position to receive a successive disk from the conveyer 3. Such successive disk may then be lowered into the furnace and treated as the preceding disk has been treated.

Hot vapors which escape from the fur nace15 are caught by the hood 30 and portions of them are conveyed by the pipe 31 to the pre-heating chambers 2. It ma be that the heat supplied to the chamber 0m the pipe 31 is not suflicient to raise the said chamber to the temperature desired. If this should be the case additional heat may be supplied in any desirable known manner. The portions of heated vapors which do not pass from the hood 30 through the pipe 31 pass to the right through a pipe 32 to an annealing chamber 33.

After a disk has been treated in the furnace 15 it is removed therefrom and is passed along to the compressing or die chamber 35. This chamber comprises an open-topped receptacle 36 secured to the underneath side of the table 12 by means of screws 37. The inner surface of the side walls of the said receptacle are flush with the edges of the opening 38 in said table. The inside of the receptacle 36 is provided with an annular lining 40 which is removable. These linings may be of different thicknesses so that disks of varying diameters may be produced without changing the size of the receptacle 36. By reducing the thickness of the lining from the thickness shown a disk may be ormed of greater di ameter than its diameter at the time it is being heated in the furnace 15.

41 designates a rod of such size as 'may be desired which projects upwardly from the bottom of the receptacle 36. lts purpose is to roject through the central opening in the a rading disk which is being treated therein and to act as a core to control the size and shape of said opening. The dish which are treated in the die or compression chamber 35 are supported upon a disk 42 normally resting upon the bottom of said chamber within the said annular lining 40. The said disk is connected by means of rods 43 with a head 44 connected to the upper end of a piston rod 45 the lower end of which is connected with a piston 46 situated in a cylinder 47 A fluid under pressure is ada ted to be conveyed through the pipe 29 to t e cylinder 47 underneath the said piston 46 to operate the latter to raise the head 44 and lift the parts connected therewith so as to carr the disk 42 upwardly until its upper sur ace shall be flush with the upper surface of the table 12. In such position the disk which has been treated in the die or compression chamber 38 may be moved forward to make room for a succeeding or following abrading disk which it is desired to treat therein.

The valve 29 not only controls the assage of fluid under pressure through the said pipe 29 to the cylinder 28 but also controls the passage of such fluid to the cylinder 47.

T e weight of the pistons 27 and 46 and the parts connected therewith is suflicient to cause downward movements of said pistons when the valve 29 is turned so that the pipe 29 leading from said cylinders is open to permit the outflow of the fluid under pressure therein.

After an abrading disk has been placed in position upon the disk-like part 42 and has been lowered into the compression or die chamber and while in a plastic state the compression head 50'is forced down on to the same to compress and compact it, forcing the said disk to conform exactly to the shape and size of the chamber 40 and also forcin the material of said disk to lie closely and tightly against the outer surface of the core 41. The head 50 is connected by the piston rod 51 to the piston 52 which operates in the cylinder 53. The said piston is actuated in known manner by a fluid under pressure which is conve ed thereto through the pipe 54. Such flui is admitted to the upper or lower side of the piston 52 by means of a valve 55 of known construction. After a disk has been properl compressed and com pacted and condense b the action of the head 50 thereon it is 1i ted out of the said compacting or compression chamber and is moved forward on to the endless conveyer within the annealing chamber 33 and is carried slowly forward therethrough, the temperature thereof radually reducing or decreasing and the sai disk being thereby toughened and strengthened. When the disk shall have passed from the annealing chamber its manufacture is completed and as soon as it shall become entirely ,cool it will be ready for use.

The conveyer 6Q is supported upon drums 61 which in turn are supported upon the standards 62 which rise from the floor or other support 1.

I claim 1. The method of treating abrading disks in the manufacture thereof which consists in treating thesame to eliminate and remove V gases and gaseous forming substances therefrom, thereafter heating the said disks sufiiciently to render them plastic and while in such plastic state subjectin the same to pressure to condense and sdlidify the material thereof. 1

2. The method of treating abrading disks in the manufacture thereo which consists in preheating the said disks to a temperature of from 600 to 1000 F., thereafter heating the said disks to a temperature sufiiciently high to render them plastic and while in such plastic state subjecting them to PI'GSSHIG to condense and solidify the matenal thereof.

3. The method of treating abrading disks in the manufacture thereof which consists in pre-heating the sald disks, thereafter heating1 the said disks sufliciently to render thereafter heating the same to a relatively high temperature to render them plastic and while in said plastic state subjecting the said blocks to pressure to condense and solidify the material thereof and finally annealing the said blocks.

In testimony that I claim the foregoing as my invention, I have hereunto signed my name this 22d day of December, A. D. 1915.

JOSEPH A. HIOKEY. 

